"The willingness of Africans to participate in the slave trade in Africa allowed it to flourish. Africans delivered fellow Africans into the clutches of European subjugation and servitude, something the mosquito made impossible for Europeans to do themselves. The mosquito would not allow Europeans to pluck Africans from their homelands. Without African slavery, New World mercantilist plantation economics would have failed, quinine would not have been discovered, and Africa would have remained African. The entire Columbian Exchange would have been vastly different, or perhaps not have occurred at all. As it was, however, the Portuguese, and eventually the Spanish, English, French, Dutch, and other Europeans, were able to tap into the existing internal African slave culture that revolved around captives of war. Africans initially sold their captives to the Portuguese, and small, localized slave trade emerged. Originally, it generally operated under the cultural umbrella of customary and conventional African slavery. By exploiting this traditional feuding among African nations and social networks, Europeans were able to introduce a vastly different form of captive slavery, one of bulk commercial export. African leaders and monarchs began raiding traditional enemies and allies alike, solely for the purpose of capturing slaves to sell at a growing number of slave forts on the coast, operated by an increasingly broad range of European nationalities. The European demand was met by an African supply of African slaves."